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• William Demopoulos　　“Generality and Objectivity in Frege's Foundations of Arithmetic”,　forthcoming in Alex Miller ed., Logic, Language and Mathematics: Essays for Crispin Wright, Oxford University Press, May 2, 2007
• John L. Bell　　“Finite Sets and Frege Structures”,　in:The Journal of Symbolic Logic, vol. 64, no. 4, 1999
• Richard G. Heck Jr.　　“Solving Frege's Puzzle”, ms.